var math=require('math');

console.log(math);


console.log(math.add(23,45))


//同步讀取文件
var fs=require('fs');
var abc=fs.readFileSync('abc.txt');
console.log(abc.toString());

//非阻塞
console.log("readFile")
fs.readFile("abc.txt",function (err,data) {
    if(err){
        console.log(err)
    }
    console.log(data.toString())
})

console.log(new Date())